Unfortunately, the Smart Play doesn't allow you to rotate the videos. In fact, this software is used to play recorded streams from the CCTVs and to watch live streams as well. If you have a common video, then download and install VLC Media Player. Since it has the necessary tools to rotate your videos to play them correctly.
You can download VLC Media Player from the application's page at Software Informer.

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Smart Play is a free to use video player similar to Windows Media Player or Quicktime that allows you to play .DAV video files. Make sure to copy the .DAV files over to your computer off of your external drive. It will not play directly from your external drive.